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Combine cilantro, vinegar, sour cream, garlic, chili powder, cumin and 1/4 teaspoon salt in a small bowl. Set aside.
Preheat grill to high.
Place potatoes in a microwave-safe container. Cover and microwave on High until just tender when pierced with a fork, 3 to 3 1/2 minutes.
Toss the potatoes, steak and pepper pieces with oil and the remaining 1/4 teaspoon salt in a large bowl. Thread the potatoes, steak, peppers and onion chunks onto 8 skewers. Grill, turning once or twice, until the steak reaches desired doneness, about 6 minutes for medium. Serve the kebabs with the reserved sauce.